I totalled up the expected loads for the small "bump-out" I'm adding to the kitchen. To error on the side of caution, I doubled the figure and used that in combination with the load bearing figures for clay. That adds up to a greatly exagerated size of 32" dia footing (I'll be using two).
As a double check, using the tables for a one story addition and clay soil (R403.1), I need a 12" wide footing. If I take that bearing area over the length of the wall and divide it into two round footings, I get 36" dia (pretty close).
I'm becoming a big chicken with this work, so while the engineer is sizing the headers I'll have him double check the footing size.
The question is, is there any recommendations as to placing rebar in the footing? A 6x6 column will be attached to the footing using a J-bolt and Simpson post base. I may have missed it but I didn't seen any requirement about rebar in the IRC for footings, only for foundations.
Frost depth is 24" so I'll make the footing 30" deep plus an inch or two above ground. I'll be using 2500 psi concrete. Is the J-bolt enough or should there be additional rebar. What size and orientation for rebar within the footing. I did read that rebar should be covered by at least 3" of concrete.